Matucana ritteri is a species of Matucana found in Peru.
Matucana ritteri usually grows solitary with flattened spherical, glossy dark green shoots and reaches a height of with a diameter of . There are twelve to 22 blunt ribs present. The straight to slightly curved brownish-black spines turn gray with age. The one to five central spines are, the seven to 14 radial spines long.
The crooked, crimson flowers are long and have a diameter of . The bright red and green, scaly fruits reach a diameter of .[1]
Matucana ritteri is common in the region of La Libertad in Peru, near Otuzco at altitudes of 2500 meters.
The first description was in 1959 by Albert Frederik Hendrik Buining.[2] The specific epithet ritteri honors the German cacti specialist Friedrich Ritter. Nomenclature synonyms are Submatucana ritteri (Buining) Backeb. (1962) and Borzicactus ritteri (Buining) Donald (1971).